Dynamical dislocation emission processes from twin boundaries

Wang, Y. B.; Wu, Bo; Sui, M. L.

doi:10.1063/1.2965637

Cited by 63 publications

(38 citation statements)

References 30 publications

(23 reference statements)

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“…Dislocation reactions at twin boundaries have been observed both experimentally [2,3,[23][24][25][26][27][28][29][30][31][32] and by molecular dynamics (MD) simulations [33][34][35][36][37][38][39][40][41]. However, no systematic investigation has been reported.…”

Section: Introductionmentioning

confidence: 99%

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Dislocation–twin interactions in nanocrystalline fcc metals

et al. 2011

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Dislocation interaction with and accumulation at twin boundaries have been reported to significantly improve the strength and ductility of nanostructured face-centered cubic (fcc) metals and alloys. Here we systematically describe plausible dislocation interactions at twin boundaries. Depending on the characteristics of the dislocations and the driving stress, possible dislocation reactions at twin boundaries include cross-slip into the twinning plane to cause twin growth or de-twinning, formation of a sessile stair-rod dislocation at the twin boundary, and transmission across the twin boundary. The energy barriers for these dislocation reactions are described and compared.

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Section: Introductionmentioning

confidence: 99%

“…To understand how the 30°partial Ba on the BCD slip plane can be transmited across the twin boundary we need to invoke the double Thompson tetrahedron [28], illustrated in Fig. 4.…”

Section: Transmission Of the 30°partial Across The Twin Boundarymentioning

confidence: 99%

Dislocation–twin interactions in nanocrystalline fcc metals

et al. 2011

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“…However, it is a postmortem technique, which makes the analysis of the twinning process non-trivial. In recent years, in situ HREM has been used to observe the twinning process, twin-dislocation interactions and other deformation mechanisms in nc materials [119,156,215,217,218]. Such experiments are still relatively difficult, and the quality of the atomic images is expected to improve in the near future.…”

Section: Experimental Observationsmentioning

confidence: 99%

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,141

447

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“…TBs act as the efficient barriers for dislocation propagation inside the grains, different from the twin-free NC counterparts. Besides, TBs firstly can be the containers for dislocation aggregation and then become dislocation sources after losing coherency during plastic deformation, 45,46 which relieves local stress concentration and make further plasticity into reality. So the perfection of TBs is critical to the strengthening effect of NT materials.…”

Section: Introductionmentioning

confidence: 99%

Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts

Sun

2018

npj Comput Mater

122

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The recent studies on nanotwinned (NT) and hierarchical nanotwinned (HNT) face-centered cubic (FCC) metals are presented in this review. The HNT structures have been supposed as a kind of novel structure to bring about higher strength/ductility than NT counterparts in crystalline materials. We primarily focus on the recent developments of the experimental, atomistic and theoretical studies on the NT and HNT structures in the metallic materials. Some advanced bottom-up and top-down techniques for the fabrication of NT and HNT structures are introduced. The deformation induced HNT structures are available by virtue of severe plastic deformation (SPD) based techniques while the synthesis of growth HNT structures is so far almost unavailable. In addition, some representative molecular dynamics (MD) studies on the NT and HNT FCC metals unveil that the nanoscale effects such as twin spacing, grain size and plastic anisotropy greatly alter the performance of NT and HNT metals. The HNT structures may initiate unique phenomena in comparison with the NT ones. Furthermore, based on the phenomena and mechanisms revealed by experimental and MD simulation observations, a series of theoretical models have been proposed. They are effective to describe the mechanical behaviors of NT and HNT metals within the applicable scope. So far the development of manufacturing technologies of HNT structures, as well as the studies on the effects of HNT structures on the properties of metals are still in its infancy. Further exploration is required to promote the design of advanced materials.

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Dynamical dislocation emission processes from twin boundaries

Abstract: Articles you may be interested inSurface and grain boundary scattering in nanometric Cu thin films: A quantitative analysis including twin boundaries J.

Cited by 63 publications

References 30 publications

Dislocation–twin interactions in nanocrystalline fcc metals

Dislocation–twin interactions in nanocrystalline fcc metals

Deformation twinning in nanocrystalline materials

Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts

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